Charted Depth On a navigational chart the depth of water marked is the charted depth. The depth of the water shown is at Chart Datum
Chart Datum This is the lowest tide level ever seen. Navigational charts are always marked at the lowest depth of water.
Height of Tide This is the height of the water above chart datum and displayed in the tide tables
Drying Height How far above chart datum a rock or sandbar dries
Rising or Flood Refers to the tide coming in
Fall or Ebb Refers to the tide going out
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